package squid3 3.3.8-1ubuntu6.6 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

I uninstall squid, and then error

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: squid3 3.3.8-1ubuntu6.6
ProcVersionSignature: Ubuntu 3.13.0-85.129-generic 3.13.11-ckt36
Uname: Linux 3.13.0-85-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.19
AptOrdering:
 squid3: Install
 squid: Install
 squid3: Configure
 squid: Configure
Architecture: amd64
Date: Fri May 6 15:06:21 2016
DuplicateSignature: package:squid3:3.3.8-1ubuntu6.6:subprocess installed post-installation script returned error exit status 1
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2016-05-03 (3 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
RelatedPackageVersions:
 dpkg 1.17.5ubuntu5.6
 apt 1.0.1ubuntu2.13
SourcePackage: squid3
Title: package squid3 3.3.8-1ubuntu6.6 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)